Dunno. Norton says it blocked a high risk intrusion attempt, A .PDF file or something, and then immediately after Acrobat tries to open a PDF file. I just immediately closed Acrobat. No ill effects that I'm aware of. I basically just closed it before it had a chance to load, I guess. I don't know crap about computers, but I do know a "High risk intrusion" is not something I want to give half a chance to open itself. THis has happened 3 times to me, all on this site.